Look for a problem, maybe some burning indicating a poor connection, at the main harness connector from the body to the left front seat. It is at the lower left rear of the seat, has a plastic guard that covers it. You will need to disconnect it and look at both sides. Also, disconnect the connectors at the memory seat module under the front of the left front seat, look for the same signs. If you are fortunate, it may resume working when you reconnect the module.